Primer lock



Nov'. 5, 1929.

PRIMER LOCK Filed Feb. 8, 1929 A1-rn RN EY E.V BA RTL-:Ll 1,734,152.

Patented Nov. 5, 1929 ERICH BARTELS, 0F. DUSSELDORF, GERMANY; SSIGNORTOTHE FIRM OF RHEINISCHE METALLWAAREN- UND4 MASG'HINENFABRIK, OFDUSSELDOBF-DERENDORF, GER- MANY PRIMIEB LOCK` Application filed February8, 1929, Serial No.

The construction of" a primerl lock.` with trigger7 that is to say Athe.construction ofzthe most important and simultaneously the mostsensitive portion: of the breech mechanism of a' gun is `clearlydetermined by` thel fact, that all details must be limited innumber.asfar as possible and must beeasily exchangeable, so las to adapt' thegun for services in the'iield. Particularly all `the'diilierent elementsof. the primer lock must be` arranged as close together aspossible, soas to require for their reception the smallest possible bore inA thebreeclrmechanism, thereby effectively opposing an. unnecessary reductionofr the strength of the breech portion.

The object of the present invention is to provide a device which answersall purposes indicated above.

lVith regard to known constructions the device according-to theinvention is'characterized bythe actthat the trigger is arranged intheplunger-like percussion hammer and by a particular formation of thelatter which permits the arrangement of all members,` with the exceptionof the trigger shaft, in a single bore of the breechblock. Hereby it ispossible to remove or insert the primer loclc while the breech mechanismis closed whichmaysbe-elected by simply disengaging the protecting coverwhich serves as an abutment for the main spring andf is 4bayonet-likearranged inthe breech' member. Moreover such a constructionrobviates aparticular recess in the breech memberfor the reception of' a lockmember.l arranged separately from thepercussion hammer.

The accompanyingdrawing shows'by way of example a device according tothe invention as applied to a breech mechanism on a gun. i

Figure 1 shows a: part: sectional view of the primer lock with thetriggerV in the position of rest; Figure 2 illustrates infpart sectionalelevation the primer lock. in. theposition in which the trigger leverisfcompletely tilted, that istosay the main spring istensioned to amaximum rFigure 3 isa part sectionallview of the primer lock in thereleasedf position; Figure 4 is a part sectional elevation of the deviceaccording to the invention showing 338,600,` andinGermany February 20,1928.

the-diierent parts in the position they occupy at the beginning ofthereturn movement of the lockinto'the position of rest after release ofthe triggerl lever.; Figure 5 is a cross section on line I--I` of'Figure l looking from the point of the percussion hammer; Figure 6 is across section also on line I-'I of Figure l, but looking in thedirectionrom the butt-:end of the percussion hammer; Figure 7 is abottom plan View ofthepl'unger ;,Figure Srillustratesatop plan vieni ofthe plunger; Figure 9 shows elevationV of the trigger member and Figurel0 is aview, of the front-spring abutment looking from` the point of thepercussion hammer.

The cylindrical; plunger body b'- of. the primer lock carries'atitsfront face `the point b1 of thepercussionhammer and` is slidablyarrangedl in a bore ai of the breech mechanism a provided in theprolongation or ez;- tensionY of the axis of the bore of' the gun.Rotation o1E the longitudinally movable plunger I) is prevented by anose Z22 slidingly engagingv a corresponding groove` of the wedgemember. A part ofthe plunger Z) is providedwith: a bore for thereception of the main spring f. A cover a2 connected bayonet-like to thebreech member serves as fixed rearward abutment for the spring f. Thefront end of-thespring fbears against a disc 0 arranged'with a certainplay in the bore b4 of the plunger b; The disc e carries at its lowerpart an eye c1 snugly litt-ing a longitudinal slot fof the plunger bodyA conical pin d of small;` diameter, arranged normally to a vertical'plane passing through the axis of the percussion hammer, is extendedthrough the holeof the eye el. Hereby it is possible t-,o tilt the discc about a certain angle rearwardly with regard to the vertical crosswall; b3 ofthe plunger body Z2. Furthermore'the face of the disc cdirected towards thel point b1, of the percussion. hammer carries acam-c3 which-extendsthrough a bore bs ofV the plunger vbody b and bearsagainst the slide`- face g1 of the trigger gthe pivot pinv g2 ofA whichis rotatably arranged in the plunger body b. y As the main springisinserted? under a certain tensiointhe trigger g, positivelyengagesthacam` 03; of the disc c Meer d bled.

lever gg'hinged to the trigger g, causes the cooking or thetensioningandfthe release of the primer lock when the trigger shaft `isrotated. Finally, after trigging` and after the plunger body b has beenrsuddenly moved forward, the trigger shaft is, after release of thetrigger lever, rotated backwardly, whereby the cam disc e is alsoreturned, so that the of the recess Z912 of the plunger body b, wherebythis body, mostly under the influence of'a torsional spring connected tothe trigger shaft, is returned to its position ofrest.

During the release period the cinematic movements of the several partsof the primer lock are carried out in the order shown in Figures l to 4.

When in the so called position of rest (Figure l) the primer lock is tocock and to re- Y lease, the trigger shaft is rotated in the directionof the arrowA e shown in Figure l, whereby the cam disc e, rigidlyconnected to the trigger shaft, is also rotated in the same sense. Asthe face e3 of the cam disc e engages the finger lever g3 of the triggerg, journalled inthe plunger body b, the initiated torque causes alongitudinal backward movement of the plunger body b and therefore thecooking ortensioning of the main spring f. This movement is continueduntil the shoulder surface e4 of the came disc e coincides with theplane'passing through the surface g5 of the finger lever g3 hinged tolthe trigger g (Figure 2).. When this position i's reached the plungerbody isV suddenly moved forward under the action of'thespring f, wherebythe pointV b1 of thejpercussionY hammer is brought linto the primingposition (Figthe primer lock a to allow the opening 'ofthe breechmember. To effect'fthis, the trigger shaft is under the action of atorsional spring not shown in the drawing by which, after re'- Vlease ofthe' trigger-"lever, this lever and -therefore the trigger shaft alsoare'returned to the original position; When during this rotationalmovement the trigger shaft occupies the position shown in Figure 4, thestop surface. e2 of the cam'disc e, rigidlyv connected' Y to thetrigger' shaft, bears against the wall of a-rec'ess `of the plunger`body b, whereby this body and with the same the pointl of the`percussion hammer is,v untilthe final exit positionl of the triggerleverl (Figure 1)' is `reached,'forc'ed backinto the plunger body sofar, that the point b1 ofthe percussion ham- 1 mer doesnot longereXtendintoYt-hepath of the breech mechanism in the bottom piece of thebarrel. During this time the nger lever g3 occupies with regard to thecam disc the position required for effecting again the pulling of thetrigger. For this purpose the main spring is inserted with a 'certaintension, so that Vthe came2 of the front-disc e, tilting-about a certainangle around the axis of the pin positively engages-the surface g1 ofrthertriggerrg. 'Ihe finger lever g3, rigidly connected to the trigger g,rolls along the surface e3 of the cam disc `until the A trigger lever orthe trigger shaft occupies the second cam face e2 of same engagesthewall original position and the nger lever g3 engages behind the camdisc e3 occupying thereby'with regard to this disc aposition which againallows pulling ofthe trigger. What I claim is: l l. VIn a primer lockfor thebreech mechavnism of a gun, in combination a percussion hammerslideably fitting said breech mechanism, a cam disc fixed upon a springactuated *Cookino shaft rotatably arranged in said breechlblock, triggerournalled in said percussion hammer and. cooperating with said cam disc,a spring located in a bore of said percussion hammer, a disc forming abearing for said spring and swingably arranged in said bore and a cam onsaid disc cooperating with said trigger. v Y

, 2. In a primer lock for the breech mechanism-of a gun, in combinationa percussion hammer slidably fitting said breech mechanism, a cam discfixed upon a spring actuated cooking shaft rotatably arranged in saidbreech block, a triggerjournalled in said percussion hammer, said dischaving a plurality of cams some' ofwhieh cooperate with an'arm'eXtending from said trigger and one of which being adapted. toenter a recess of said percussion'hammer, so as to. allow retraction ofsaid percussionv hammery after firing, a spring located lin aV boreofsaid'percussion hammer, a disc formingsabearing for said spring andswingably arrangedin Vsaid bore and a cam on'said'disck cooperating witha Yprojection provided Yon' said trigger.

' VA primer lock as set forth in the pre-V ceeding claims, in which saidrcam disc is formed Vasa double rarmed lever Yone arm of which, duringrotationiof s aidcocking. shaft Y for the ,purpose offcockingsaidpercussion hammer, presses uponsaidtrigger and the ...other armtofwhich, during the automatic return ofthe cooking shaft after release ofthewtrigger vand advance ofthe percussion Y. bolt,fpress'es againstlastop ofsaidpercussion hammer for retracting said latterinto Va safetyposition, wherel'ip'onV said cam disc occu- -pies a position lin frontof said Vtrigger and said YYstop' ofv said percussion hammer.

' In testimony whereof I have affixed my signature. Y

lli

